The interior of the OLITA (Our Lord In The Attic) museum. The attic of this bourgeois house conceals a secret Catholic church, known as Ons' Lieve Heer op Solder (Our Dear Lord in the Attic), originally built in 1663, when Catholics lost their right to workship in their own way. The lower floors of the building became a museum in 1888 and today contain refurbished rooms, as well as a collection of church silver, various religious artifacts and paintings.